Movie Maker is pre-installed on most Windows computers.  Assuming you have it installed you could use Movie Maker to produce videos which can be viewed on any device to engage students in a topic.  Or students could produce a video to engage their own audience.

You don't need a video camera to make use of this software, you can import photographs or images found on the Internet.

Here is a tutorial which will help you to use Movie Maker if you have never used it before: